JP2008228842A - Denture surveyor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To objectively recognize the inclination of an undercut from contour points in support base teeth C, C' and C" or the like as a numerical value when producing a clasp 35 to be hooked to the support base teeth C, C' and C" in order to fix a partial denture base, and to efficiently produce the partial denture base with reproducibility. <P>SOLUTION: In the state of positioning one of two detection needles 27c, 29c or 31c selected from three detection needles 27c, 29c and 31c at one support base tooth to which the clasp 35 for fixing the partial denture base is to be hooked, when the other detection needle is abutted to the contour point on the other support base tooth side, the swing angle of a detection arm can be recorded as a numerical value by an angle measuring member 33. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention provides a clasp that is latched on an abutment tooth based on an intraoral dentition mold in which a dentition is formed when a local (partial) denture that satisfies a missing part of a dentition of a patient is manufactured. It relates to a denture surveyor used to determine.

In making a local denture, it is important to determine the clasp to be hooked on the abutment tooth after deciding the attachment / detachment direction of the denture based on the intraoral dentition mold. . Conventionally, after setting the orientation of the local denture by examining the implantation state of each tooth with the intraoral dentition mold fixed on the surveyor base of the denture surveyor, tilting the surveyor base A detection needle called an analyzing rod is applied to the ridge point on the side surface of the abutment tooth where the clasp is latched, and the inclination angle and curvature of the undercut below the ridge point, the inclination of the abutment tooth, etc. are confirmed. The clasp shape and curvature are determined.

However, in the past, the undercut inclination angle and curvature of the abutment tooth were confirmed exclusively based on the experience and intuition of the denture manufacturer. For this reason, it is difficult to grasp these values as objective data, and the clasp production efficiency is poor. In particular, in the case of an intraoral dentition, the local denture is not usable because it is destroyed during the production of the local denture, so the local denture is poorly fixed, and the clasp is manufactured again or the inclination of the clasp is adjusted. In this case, it was necessary to produce an intraoral dentition mold again and measure the degree of undercut inclination and curvature of the abutment tooth, and the production efficiency of the local denture including the clasp was extremely poor.
JP-A-9-289994

The problem to be solved is that when making a clasp to fix the local denture, it is impossible to grasp the angle of inclination and curvature of the undercut in the abutment as numerical values, and the production of the local denture Inefficient.

The present invention relates to a surveyor base to which an intraoral dentition mold is fixed, and a swing arm supported on a support shaft having an axis in a vertical direction perpendicular to the plane of the surveyor base so as to be swingable in a horizontal direction. And a support member provided at the tip of the swing arm and having an axis in the vertical direction, and a bearing member pivotally supported in an arbitrary direction at the lower portion of the support member in the same plane. At least three detection arms attached so as to extend in the radial direction, and detection needles attached at the distal ends of the detection arms, each having an axis in a direction perpendicular to the extension direction of the detection arms, An angle measuring member that is rotatably supported about the axis line at a lower portion of the support member and that measures a swing angle of the detection arm with respect to the support member, and includes two detection needles selected from the three detection needles, One detection needle is connected to the cluster that fixes the local denture. The angle of the swing angle of the detection arm when the other detection needle is in contact with the prominence point on the other abutment tooth with the angle measurement member It is possible to record as.

  The present invention makes it possible to objectively grasp, as numerical values, the inclination of the undercut from the hoof point in the abutment tooth when producing a clasp that is latched to the abutment tooth in order to fix the local denture. The local denture can be manufactured efficiently.

The present invention is a state in which one of the two detection needles selected from the three detection needles is positioned on one abutment tooth on which a clasp that fixes the local denture is hooked. The best mode is that the swing angle of the detection arm when the other detection needle is brought into contact with the ridge point on the other abutment tooth side can be recorded as a numerical value by the angle measuring member.

The present invention will be described below with reference to the drawings showing embodiments.
In FIG. 1 and FIG. 2, in order to manufacture a local denture on the surveyor base 3 of the denture surveyor 1, in order to fix the intraoral dentition mold 5 in which the patient's oral cavity is molded with plaster or the like, Three fixed shafts 7 having axes in the vertical direction are fixed. Among them, the two fixed shafts 7 positioned on the back side of the surveyor base 3 are fixed in the horizontal direction at a distance narrower than the lateral width of the oral cavity dentition mold 5. A fixing screw having an axis line in the horizontal direction on the upper portion of the remaining fixed shaft 7 located in front of the surveyor base 3 and capable of screwing toward an intermediate portion between the other two fixed shafts 7. 9 is screwed. The intraoral dentition mold 5 placed on the surveyor base 3 is clamped and fixed by a fixing screw 9 that is screwed in a state where the back side is pressed against the two fixing shafts 7.

The surveyor base 3 is provided with a support shaft 11 having an axis in the vertical direction. A first swing arm that extends in the horizontal direction and constitutes a part of the swing arm is provided above the support shaft 11. 13 base end parts are supported so that rotation is possible. Further, a base end portion of a second swing arm 15 that extends in the horizontal direction and constitutes a part of the swing arm is pivotally supported at the distal end portion of the first swing arm 13 so as to be rotatable. Further, a support rod 17 as a support member having an axis in the vertical direction is supported at the tip of the second swing arm 15 so as to be movable in the axis direction.

The base end of the first swing arm 13 is fixed to the support shaft 11 by a fixing screw 19, and the base end of the second swing arm 15 is fixed to the tip of the first swing arm 13. The support rod 17 is further configured to be fixed to the distal end portion of the second swing arm 15 by the fixing screw 23 by the screw 21.

A ball bearing 25 as a bearing member is supported on a support ball 17a (shown by a one-dot chain line in FIG. 2) provided at the lower part of the axis of the support rod 17, and the ball bearing 25 includes three detection arms. 27, 29, and 31 are attached so as to extend in the radial direction at equal intervals around the axis. Each detection arm 27, 29, 31 is supported by a first arm 27 a extending in the horizontal direction with respect to the ball bearing 25 so that the base end portion is supported so as to be swingable in the horizontal direction perpendicular to the central axis of the ball bearing 25. 29a, 31a, and a second arm 27b extending in a horizontal direction that coincides with the first arms 27a, 29a, 31a, with a base end supported at the distal ends of the first arms 27a, 29a, 31a in a swingable manner. 29b, 31b.

The detection arms 27, 29, and 31 incline the horizontal plane assumed by the detection arms 27, 29, and 31 at an arbitrary angle when the ball bearing 25 is swung with respect to the support ball 17a.

First to third detection needles 27c, 29c, and 31c whose axes coincide with each other are attached to the distal ends of the second arms 27b, 29b, and 31b so that their positions can be adjusted in the vertical direction. These detection needles 27c, 29c, and 31c are normally adjusted so that the lengths from the tips of the second arms 27b, 29b, and 31b to the lower side coincide with each other.

An angle measuring member 33 is attached to the lower part of the support rod 17. The angle measurement member 33 is fixed to the attachment ring 33a that is rotatably supported by the support rod 17, the angle measurement center point is the center of the support ball 17a, and each detection arm 27, And an angle scale plate 33b in which scales are arranged in line with the central axes of 29 and 31.

Next, the measurement effect | action of the abutment tooth in the intraoral dentition type | mold by the denture surveyor 1 comprised as mentioned above is demonstrated.

First, in the state where the intraoral dentition mold 5 placed on the surveyor base 3 is pressed against the two fixed shafts 7, the fixing screws 9 provided on the remaining fixed shafts 7 are screwed and fixed. Let After observing the intraoral dentition mold 5 and determining the attaching / detaching direction of the local denture and the abutment tooth on which the clasp (not shown) is hooked, the first swing arm 13 and the support shaft 11 The second oscillating arm 15 is oscillated with respect to the first oscillating arm 13 to position the support rod 17 at the center of the midline in the intraoral dentition mold 5. In this state, the fixing screws 19 and 21 are tightened to keep the first and second swing arms 13 and 15 bent. (See Figure 3)

Now, the intraoral dentition mold 5 is the upper jaw, the right first to fourth teeth and left first to fifth teeth, the left seventh and eighth teeth of the dentition are healthy teeth, the right fifth to eighth teeth and left The sixth tooth is a missing tooth, and the right fourth tooth C and the left fifth tooth are the abutment teeth as the clasp portion for fixing the local denture consisting of the right fifth to eighth teeth and the left sixth tooth in the oral cavity. C ′ and the left seventh tooth C ″. The clasp is made of a metal material such as a Co—Cr alloy or a Pt—Au alloy, and is attached so as to surround the abutment teeth C, C ′, C ″. It is a member that fixes a denture, and is composed of left and right arms that are latched around the abutment teeth C, C ′, C ″ and a rest that is hung on the upper end of the abutment tooth.

When manufacturing the above-mentioned clasp, the mutual spacing of the abutment teeth C, C ′, C ″, the inclination of the abutment teeth C, C ′, C ″, and the holon on the sides of the abutment teeth C, C ′, C ″ It is necessary to measure the inclination state and the bending state of the undercut from the point.

When measuring objective data related to the above-mentioned abutment teeth C, C ′, C ″, first, to measure the distance between the two abutment teeth C, C ″, for example, where the clasp is latched. The first and second arms 27a, 27b, 29a, 29b are held in a state where the detection arms 27, 29 located on the respective abutment teeth C, C ″ side are kept in the horizontal direction perpendicular to the axis of the support rod 17. Each of the detection needles 27c and 29c is bent and positioned above the side surface of each abutment tooth C and C ″.

In this state, the fixing screw 23 is loosened and the support rod 17 is lowered to a position where the detection needles 27c and 29c are in contact with the upper surfaces of the selected abutment teeth C and C ″, and then the fixing screw 23 is tightened. Then, the support rod 17 is fixed, and the distance between the detection teeth 27c and 29c is measured with a ruler (not shown) to determine the distance between the abutment teeth C and C ″. (See Figure 4)

Next, in order to measure the inclination of the undercut in the abutment tooth, first, the first and second arms 27a and 27b and 29a and 29b located on the abutment tooth C and C ″ side are bent and detected. The needles 27c and 29c are positioned on the side surfaces of the respective abutment teeth C and C ″ at diagonal positions passing through the center of the pivot support ball 17a. Further, in the above state, the angle measuring member 33 is rotated with respect to the support rod 17, and the plane of the angle scale plate 33b is made to coincide with a virtual line connecting the detection needles 27c and 29c.

Next, the fixing screw 23 is loosened so that the tip of the detection needle 29c positioned on the side of the abutment tooth C, which becomes a reference when attaching and detaching, for example, is positioned above the opposite abutment tooth C ″. Then, the fixing screw 23 is screwed and fixed.

In this state, the ball bearing 25 is swung with respect to the support ball 17a while the first and second arms 29a and 29b are bent, and the tip of the detection needle 27c comes into contact with the ridge point on the side surface of the abutment tooth C. Thus, the detection arms 27 and 29 are swung and inclined. At this time, as described above, in each of the detection needles 27c and 29c, the imaginary line connecting them coincides with the center of the support ball 17a. Further, the vertical plane passing through the imaginary line connecting the detection needles 27c and 29c and the plane of the angle scale plate 33b coincide.

The denture maker then records the swivel angles of the detection arms 27 and 29 tilted by the scale of the angle scale plate 33b after recording the ridge points on the side surface of the abutment tooth C and records them as numerical values. Thereby, the inclination state of the undercut from the hoofong point in the abutment tooth C is grasped as a numerical value. (See Figure 5)

The prosthetic tooth manufacturer marks the tip of the detection needle 27c in contact with each of the protuberance points according to the above-described operation for the plurality of protuberance points sampled on the side surface of the abutment tooth C, and undercuts the inclined state from each of the protuberance points. Is read and recorded as a numerical value from the angle scale plate 33b.

Then, the denture maker manufactures the clasp by determining the inclination state and the bending state of each arm portion in the clasp based on the numerical values relating to the undercut inclination state from each hoof point in the sampled abutment tooth C.

  Further, in order to measure the inclination angle of each abutment tooth C, C ′, C ″ with respect to the midline, the denture maker makes the abutment to be measured with respect to the support rod 17 so that the plane of the angle scale plate 33b is to be measured. The position is adjusted so as to be orthogonal to the central axis of the detection arms 27, 29, 31 located on the teeth C, C ', C "side.

Next, when the denture maker measures the inclination of the abutment tooth C, for example, the ball bearing 25 with respect to the axial support ball 17a and the axis of the detection needle 27c coincide with the inclination of the abutment tooth C. Then, the inclination of the detection needle 27c is read by the angle scale plate 33b and recorded as a numerical value. (See Figure 6)

In the present embodiment, the angle measuring member 33 provided on the support rod 17 can grasp the undercut inclination state from the ridge points on the side surfaces of the abutment teeth C, C ′, C ″ as objective numerical values. Traditionally, it is possible to produce clasps that depend exclusively on the experience and intuition of the denture manufacturer, based on the measured values, and record them as numerical values, so that local dentures can be produced. It is excellent in reproducibility and can improve the production efficiency.

In the above description, the tilt angle of the detection arm is read and recorded by the scale of the angle scale plate. However, a predetermined angle is provided at the concentric position of the angle plate to form a large number of holes and the position of the angle 0 degree. The light emitting member and the light receiving member may be arranged on both sides of the hole that coincides with the above, and the tilt angle of the detection arm may be optically read and displayed numerically.

It is a perspective view which shows the outline of a denture surveyor. It is a general body perspective view which shows the support state of the detection arm with respect to a support member. It is explanatory drawing which shows the state which fixed the intraoral dentition mold to the surveyor stand. It is explanatory drawing which shows the space | interval measurement effect | action of an abutment tooth. It is explanatory drawing which shows the measurement state of the undercut from the ridge of the abutment tooth side surface. It is explanatory drawing which shows the effect | action which measures the inclination state of an abutment tooth.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Denture surveyor 3 Surveyor base 5 Intraoral dentition mold 11 Support shaft 13 The 1st rocking arm 15 which comprises a part of rocking arm The 2nd rocking arm 17 which comprises a part of rocking arm Support member Support rod 17a as support shaft 25 Ball bearing 27, 29, 31 Detection arm 27c, 29c, 31c Detection needle 33 Angle measuring member 33b Angle scale plate C, C`, C "Abutment tooth

Claims (5)

A surveyor base to which the oral dentition mold is fixed;
A swing arm supported by a support shaft having an axis in a vertical direction perpendicular to the plane of the surveyor base so as to be swingable in the horizontal direction;
A support member provided at the tip of the swing arm and having an axis in the vertical direction;
At least three detection arms attached to a bearing member that is pivotally supported in a lower part of the support member so as to be swingable in an arbitrary direction so as to extend radially in the same plane;
At the tip of each detection arm, a detection needle attached with an axis in a direction orthogonal to the extending direction of the detection arm,
An angle measuring member that is supported at the lower part of the support member so as to be rotatable about an axis, and that measures the swing angle of the detection arm with respect to the support member;
With
Of the two detection needles selected from the three detection needles, one detection needle is positioned on the other abutment tooth on which the clasp that fixes the local denture is fixed. Is a denture surveyor that can record the rocking angle of the detection arm when it comes into contact with the prominence point on the other abutment tooth side using an angle measuring member. The swing arm according to claim 1 is a denture surveyor in which at least two swing arms are connected so as to be swingable, and the distance from the support shaft can be varied by bending the swing arm. Each detection arm according to claim 1 is a denture surveyor in which at least two arms are connected so as to be swingable, and the distance from the support member can be changed by bending the arm. The denture surveyor according to claim 1, wherein the detection arm is swingable at an arbitrary angle by a support ball provided at a lower portion of the support member and a ball bearing that is swingably supported by the support ball. The angle measuring member according to claim 1 is a denture surveyor having an angle scale plate whose angle measurement reference point coincides with the central axis of the detection arm.

Images